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I took a deep dive into the Köppen climate classifications for world regions. After studying many websites and research devoted to charting the world by climate based on the work of German-Russian climatologist Wladimir Köppen in 1884, I decided on a simple chart that groups world cities by similar climate, There are so many ways to visually show the similarities, differences and relationships in this realm that it was a challenge and the graphic's evolution had a long and twisted path to what you are seeing below.  Because so many of the climate zones did not contain any large world cities, I added a second graphic which covers almost all of the zones by mapping world counties to their U.S. counterparts due to the fact that the U.S. is the country with the most zones. If you are from the U.S., I find this an entertaining way to relate to the climates of other cities.

world cities by Koppen climate classification
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